Normal pressure hydrocephalus (NPH) is a type of hydrocephalus that usually occurs in older adults and the average age of person with NPH is over age 60. NPH is defined by a clinical triad of dementia, gait difficulties, and urinary urge incontinence coexisting with ventriculomegaly on a relevant radiological examination, such as computed tomography (CT) or magnetic resonance scan (MRI), and demonstrating ventricular enlargement disproportionate to the degree of cerebral atrophy. NPH is different than other types of hydrocephalus in that it develops slowly over time. The drainage of CSF is blocked gradually, and the excess fluid builds up slowly. The slow enlargement of the ventricles means that the fluid pressure in the brain is not as high
